JQuery How to replace strings inside a textarea?

Question

Current Textarea:

This text area could be full of information..www.london2012.com
And might contain upto 5 links that a         
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                              <a class="fly-avatar" href="https://www.e-learn.cn/qa/u-93.html">
                <img src="https://www.e-learn.cn/qa/data/avatar/000/00/00/small_000000093.jpg" alt=" ">
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                <a href="https://www.e-learn.cn/qa/u-93.html" class="fly-link">
                  <cite>灰色年华 </cite>       
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                            <div class="detail-hits">
                <span>2021-01-16 19:51</span>
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<p>fiddle</p>

<p>This will replace all the links and leave the other text there as well.</p>

<pre><code>$(function(){
var old = $('#event_content').val();
var news = old.replace("www.london2012.com", '<a href="http://www.rio2016.com" target="_blank">www.rio2016.com</a>');   
$('#event_content').val(news);
});
</code></pre>
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                              <a class="fly-avatar" href="https://www.e-learn.cn/qa/u-31.html">
                <img src="https://www.e-learn.cn/qa/data/avatar/000/00/00/small_000000031.jpg" alt=" ">
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                <a href="https://www.e-learn.cn/qa/u-31.html" class="fly-link">
                  <cite>感动是毒 </cite>       
                </a>
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                            <div class="detail-hits">
                <span>2021-01-16 19:53</span>
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<p>I believe you are looking for something like this (click here to test this fiddle):</p>

<pre><code>$('#event_content').val(
  $('#event_content').val().replace(/\b(http(s|):\/\/|)(www\.\S+)/ig,
    "<a href='http\$2://\$3' target='_blank'>\$3</a>"));
</code></pre>
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         <input type="text" placeholder="不少于5个字" AUTOCOMPLETE="off" class="comment-input layui-input" name="content" />
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                  <cite>眼角桃花 </cite>       
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                            <div class="detail-hits">
                <span>2021-01-16 19:57</span>
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<pre><code>var link = $("#event_content");
var text = link.html();
var linktext = '<a href="' + text + '" target="_blank">' + text + '</a>'
link.html(linktext);
</code></pre>
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         <input type="text" placeholder="不少于5个字" AUTOCOMPLETE="off" class="comment-input layui-input" name="content" />
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                  <cite>夕颜 </cite>       
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                            <div class="detail-hits">
                <span>2021-01-16 20:02</span>
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<pre><code>$(function(){
    var old = $('#event_content').val();

    var news = '<a href="http://'+old+'" target="_blank">'+old+'</a>';

    $('#event_content').val(news);
});
</code></pre>

<p>Note that the <code><a></code> will not be displayed in textarea, but instead plain text will be shown.</p>

<p>Demo: http://jsfiddle.net/3xEh2/1/</p>
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    <label class="layui-form-label" style="padding-left:0px;width:60px;">发布评论:</label>
    <div class="layui-input-block" style="margin-left:90px;">
         <input type="text" placeholder="不少于5个字" AUTOCOMPLETE="off" class="comment-input layui-input" name="content" />
                        <input type='hidden' value='0' name='replyauthor' />
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           <style>
   
.laypage-main a, .laypage-main span {
    display: inline-block;
}
        </style>                  </ul>
        
        <div class="layui-form layui-form-pane">
          <form id="huidaform"  name="answerForm"  method="post">
            
            <div class="layui-form-item layui-form-text">
              <a name="comment"></a>
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<script type="text/javascript" src="https://www.e-learn.cn/qa/static/js/neweditor/ueditor.config.js"></script>
<script type="text/javascript" src="https://www.e-learn.cn/qa/static/js/neweditor/ueditor.all.js"></script>
<script type="text/plain" id="editor"  name="content"  style="width:100%;height:200px;"></script>                                 
<script type="text/javascript">
                                 var isueditor=1;
            var editor = UE.getEditor('editor',{
                //这里可以选择自己需要的工具按钮名称,此处仅选择如下五个
                toolbars:[['source','fullscreen',  '|', 'undo', 'redo', '|', 'bold', 'italic', 'underline', 'fontborder', 'strikethrough', 'removeformat', 'formatmatch', 'autotypeset', 'blockquote', 'pasteplain', '|', 'forecolor', 'backcolor', 'insertorderedlist', 'insertunorderedlist', 'selectall', 'cleardoc', '|', 'rowspacingtop', 'rowspacingbottom', 'lineheight', '|', 'customstyle', 'paragraph', 'fontfamily', 'fontsize', '|', 'indent', '|', 'justifyleft', 'justifycenter', 'justifyright', 'justifyjustify', '|', 'link', 'unlink', 'anchor', '|', 'simpleupload', 'insertimage', 'scrawl', 'insertvideo', 'attachment', 'map', 'insertcode', '|', 'horizontal', '|', 'preview', 'searchreplace', 'drafts']],
            
                initialContent:'',
                //关闭字数统计
                wordCount:false,
                zIndex:2,
                //关闭elementPath
                elementPathEnabled:false,
                //默认的编辑区域高度
                initialFrameHeight:250
                //更多其他参数，请参考ueditor.config.js中的配置项
                //更多其他参数，请参考ueditor.config.js中的配置项
            });
                        editor.ready(function() {
            	editor.setDisabled();
            	});
                            $("#editor").find("*").css("max-width","362px");
        </script>              </div>
            </div>
                          
    

        
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                <label for="L_vercode" class="layui-form-label">验证码</label>
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                  <input type="text"  id="code" name="code"   value="" required lay-verify="required" placeholder="图片验证码" autocomplete="off" class="layui-input">
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                <input type="hidden" value="JQuery How to replace strings inside a textarea?" id="ans_title" name="title"> 
             
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